CUVIER'S CHCEROPOTAMUS. 417 



comparison between the Chceropotamus and these species 

 of the Hog tribe in this particular ; but in the present 

 specimen we see that the last molar of the lower jaw (fig. 

 164, B, m 3) presents the same additional posterior tubercles 

 as in the Peccari, and confirms the view taken by Cuvier 

 of the affinities of the ancient Pachyderms. 



This tooth offers, also, a miniature resemblance to the 

 corresponding one in the Hippopotamus (see fig. 1 62, m 3) . 



All the premolars were more simple in comparison with 

 the true molars ; the last premolars of the upper jaw (fig. 

 164, A, 3 and 4,) had each an external large and an inter- 

 nal low and small tubercle, both enclosed by a basal ridge. 

 The true molars are each like two premolars combined, and 

 with the inner tubercles developed to equality with the 

 outer ones ; they have also the two small intermediate 

 tubercles and a well-developed cingulum (ib. m 1 and m 

 2) : the last upper molar (m 3) resembles that of the 

 Hyracothere. In the lower jaw the canine had much 

 of the form and proportions of that of a Carnivore. There 

 are three premolars in this jaw ; the one which answered 

 to the first premolar above was not developed in the 

 Chffiropotamus : the first in place (ib. B, p 2) had a com- 

 pressed pointed crown and a small posterior talon, like that 

 above ; the second and third increase in breadth, but are 

 narrower and more simple than those above. The true 

 molars below are also narrower than the upper ones, but 

 are quadricuspid with accessory tubercles, and a largely 

 developed hinder talon in the last molar. 



Our fossil jaw fortunately yields a fact essential in 

 characterizing the genus, and which the fragments in 

 Cuvier's possession were too imperfect to afford, viz., the 

 exact number of molar teeth in the lower jaw, which is 

 twelve. 



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